Thirds to nathaniel w



(No Model.)

2 Sheets-Sheet 1.`

T. W. DAVIES.

' PUMP.

N. PETERS. Fhnhrlilmgnpher. wnhington, D. C.

2 Sheets-Sheet 2.

(No Model.)

T. W. DAVIES.

PUMP.

III

I sd N. Pnzns. Pmwmngmhen wnhingm D. c.

.erreur erica.

THOMAS WV. DAVIES, OF BALDVIN, PENNSYLVANIA, ASSIGNOB OF TVO- THIRDS TO NATHANIEL W. KBOUSE AND DAVID B. BODGERS, BOTH OF SAME PLACE.

PUMP.

SPECIFICATION forming part of LettersPatent No. 246,091, dated August 23, 1881. Application filed May 16, 1881. (No model.)

To all whom it may concern Be it known that I, THOMAS W. Davies, ot

My invention is applicable more particularlyy to pumps for oil-wells, although it may be embodied in pumps for other purposes.

Pumps for oil-wells as commonly constructed are provided at the upper end of the pumpl or working barrel with a check or sustaining valve which is concentric with the piston-rod,v

and works up and down thereon to open and close, and is provided with packing to make the piston-rod tight. The packing of such valves is subjected to great wear by the working of the piston-rod, and it is frequently necessary to draw the pump-rods for the purpose ot' repacking the valve.

The principal object of the invention is to construct the check-valve so that it shall not be subject to wear i'rom the working of the piston-rod; and to this end it consists in the combination, with the working-barrel and piston-rod of a pump, ot' a head tted to the barrel, through which the piston-rod works, and which is constructed with a valve-seat, and a socket or neck projecting above said seat and receiving the piston-rod through it, and an annular valve tittin g outside said socket or neck and adapted to work up and down thereon to open and close, whereby the valve is relieved of all wear from the movement of the pistonrod.

The invention also consists in the combina tion, with the above, ot' a stuftingdoox at the upper end of the socket or neck through which the piston-rod works, and in a novel construction of the valve to afford provision for adjusting it so that it will leak slightly toprevent pumping the oil well in which is t-he pump completely dry.

In the accompanying drawings, Figure l represents a central vertical section ot' the lower portion ot' an oil-well and a pump arranged therein and embodying my invention. Fig. 2 represents a similar section of the upper portion of the pump upon a larger scale. Fig.

the tubing, which is connected with the work-v ing-barrel A by a screw-coupling, A4. This tubingis continued to the surface ot' the ground, andthe several lengths otl which it is composed are all connected by similar couplings.

B designates the pistou or pump rod,which has at its lowerend the working-valve B', and

lis composed otl sections to extend it to the surface of the ground. The pump-rod may be" operated by mechanism commonly employed for such purpose.

Referring, now, more particularly to Fig. 2, it will be seen that the upper end of' the barrel A is closed by a head composed ot' a casting, C, forming a body, and an outer packing or sleeve, C', of leather, Babbitt metal, or any other suitable material which will lit tightly within the barrel. The middle portion ot' the body G, upon which is the packing O', is smaller in diameter than the two end portions, and the packing is thereby retained in place, it being held between shoulders a a. The body G is constructed so as to snugly lit the pistonrod B at its two ends, l), and between the bearings bit has an internal chamber, c, into which the oil passes through ports d., and from which itis delivered through ports e extending upward through the valve-seat j'. The ports tl and e should be sufficient iu number so that combined they will give the required area ot' opening for the passage of oil. 'l'.he body G is prolonged above the valve-seat f, so as to form a neck, G2, which receives the piston or pump rod B through it, and has screwed upon its upper end a tube, D, which forms the stuffingboX, and in which packing gis compressed by a gland, D. This stung-box may be made of any desired length to contain a large quantity of packing and render frequent repacking unnecessary.

The ports e, through which the oil is dclivered into the tube A3, rising above the pump, are controlled by an annular valve, E, made of metal, and having a ground joint with the seat f. The valve E fits snugly upon the neck C2, and is free to work up and down thereon, its upward movement being limited by the shoulder 71, formed by the lower end of the tube D.

It is very desirable in oil-well pumping not to pump the well dry, because when pumped dry the surface of the rock would become dry and the rock clogged by the coagulation of the oil by the atmospheric air. To prevent this the valve E should leak a little, and I have represented the valve as provided with a port, s, extending through it, and a side port, s', communicating with the port s.

In the port s is fitted an adjusting-screw, t, which may be screwed down to more or less cut off the communication. ot the side port, s', With the port s, and thus regulate the amount of leakage.

The valve E has in its face an annular groove,j, which is coincident.- with the ports c, and the parts of the face on both sides ot' said groove are ground down on the seat f, making it tight. The annular groovej permits of the fluid leaking through the port s and the ports e, in Whatever position the valve may be.

It will be seen that when constructed according to my invention the valve E is entirely out of contact with the piston-rod, and is only subject to the wear produced by working upon the neck (l2.

It will be understood that Whenever the pump is stopped the tubing A3,- extending clear to the surface ofthe ground, is filled with oil, and the construction ot` the valve E, with its waste-passages s s', causes the oil left in the tube to fiow back into the pump-barrel, and as the foot-valve and working-valve will never be absolutely tight, such oil will leak down through them and keep the oil-fiowing surface of the rock clean and fresh.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. The combination, with the working-bar rel and piston-rod of a pump, of' a head fitting the barrel through which said piston-rod works, and which is constructed with a valve-seat and a neck projecting above the seat and receiving said piston-rod through it, and an annular valve fitting said seat outside said neck, and adapted to Work upon said neck, substantially as and for the purpose specified.

2. The combination, with the working-bar rel and piston-rod of a pump, of a head fitting said barrel through which said pistou -rod works, and which is constructed with a valveseat and a neck provided with a stufng-box through which said piston-rod works, and an annular valve fitting said seat and adapted to Work upon said neck, substantially as specified.

3. The combination ot' the head C, having the valve-seat j', containing ports c, and also having the neck C2, the piston-rod B, and the annular valve E, grooved upon its under side, substantially as specified. l

4. The combination of the head C, having the valve-seat f,containing ports e, and also having the neck C2, the piston-rod B, and the annular valve E, having the ports s s', and the adj ustin g-screw t, for controlling the said ports s s', substantially as specified.

THOMAS V. DAVI ES.

Witnesses:

W. C. ADAMS, Jr., N. W. KRoUsE. 

